JP2021020686A - Packaging box - Google Patents

Abstract

To provide a packaging box capable of suppressing body swelling.SOLUTION: The present invention provides a blank sheet for forming the packaging box in which a plurality of upper first multiplet fold line portions 10 and a plurality of upper second multiplet fold line portions 11 are alternately provided along a boundary line between a length surface 3 and a top surface 2. An upper first inclined corner portion 16 formed at a boundary area between the length surface 3 and the top surface 2 by bending along the upper first multiplet fold line portions 10, and an upper second inclined corner portion 18 formed at a boundary area between the length surface 3 and the top surface 2 by bending along the upper second multiplet fold line portions 11, are inclined at a different angle with respect to the length surface 3 from each other.SELECTED DRAWING: Figure 5

Description

The present invention relates to a rectangular parallelepiped packaging box formed by bending a blank along a crease line.

Conventionally, an object to be packaged such as bottles and cans arranged is placed on a blank sheet obtained by punching a corrugated cardboard sheet, the blank sheet is folded along a crease line to wrap the product, and a flap is joined. Therefore, there is known a wraparound case in which a case is formed while packaging a product (see, for example, Patent Document 1).

Generally, in the case of a wraparound case, the strength of the container itself is high for the PET bottles and beverage cans to be stored, but when the cases are stacked, the dented part at the bottom of the bottle etc. of the upper case due to the load of the upper case. A phenomenon occurs in which the top surface portion of the lower stage side case corresponding to the cap portion of the bottle or the like of the lower stage side case bites into the bottom surface portion of the upper stage side case corresponding to the above. Then, the distortion of the case increases by the amount of the bite, and the distortion becomes a body swelling (a phenomenon in which the central portion of the length surface bulges outward) and spoils the appearance of the case.

In the wraparound case described in Patent Document 1, the fold line of the boundary portion between the elevation plate and the flat plate is composed of one crease line portion and two parallel crease line portions. The one crease line portion and the two crease line portions are alternately provided so as to correspond to the cans to be packaged with the cut in between. As the elevation plate and the flat plate are bent along the crease line, the portion between the two parallel crease lines becomes slanted along the outer circumference of the end portion of the can.

According to this, when a stacking load is applied, the bending angles of the two parallel fold lines change to absorb the deformation in the height direction, so that the body swelling can be suppressed.

Japanese Patent No. 4126201

However, according to the wraparound case of Patent Document 1 described above, a hole is formed at the boundary between the portion of one fold line and the portion of two parallel crease lines, resulting in a tight seal. It is lowered and the intrusion of fine dust cannot be prevented. In addition, the perforated portion due to the cut as described above is likely to be caught by an external object because a step is formed, and there is a possibility that cracks or breaks may occur.

In view of such problems of the prior art, it is an object of the present invention to provide a packaging box capable of suppressing body swelling without providing a perforated portion.

In the present invention, a corrugated cardboard blank on which a crease line is formed is bent according to the crease line to form a pair of length planes that stand up facing each other and a pair that face each other in a direction orthogonal to both length planes. It is a packaging box formed in a rectangular parallelepiped having a top surface and a bottom surface facing each other in the vertical direction.

The first aspect of the present invention is a plurality of upper first composite crease line portions composed of two fold lines formed parallel to both sides along a boundary line between the length surface and the top surface. Two folds formed parallel to both sides along the boundary line between the length surface and the top surface, with the phase shifted in the direction orthogonal to the two fold lines of the upper first compound fold line portion. A plurality of upper second composite fold line portions composed of line of sight are alternately provided, and by bending the two fold lines of the upper first composite fold line portion, the boundary portion between the length surface and the top surface is formed. The upper second inclined corner portion formed at the boundary portion between the length surface and the top surface by the two fold lines of the upper first inclined corner portion and the upper second composite fold line portion. Is characterized in that it is provided so as to be inclined at different angles with respect to the length plane.

According to the first aspect of the present invention, when packaging boxes are stacked, the stacking load applied to the length surface in the vertical direction is an upper first portion inclined at a different angle with respect to the length surface. It is offset by one tilted corner and the upper second tilted corner. As a result, it is possible to suppress body swelling due to the stacking load applied to the length surface.

In the first aspect of the present invention, a single crease line extending on the boundary line between the length surface and the top surface is provided at both ends of the upper edge of the length surface in the length direction. Is preferable.

According to this, when the top surface is bent horizontally with respect to the length surface in the box making work, the upper first compound crease line portion is guided by the guidance of the single crease line at both ends of the upper edge of the length surface. And the upper second compound crease line portion can be smoothly bent.

A second aspect of the present invention is a plurality of lower first composite fold line portions composed of two fold lines formed parallel to both sides along a boundary line between the length surface and the bottom surface, and the lower portion. From the two fold lines formed parallel to both sides along the boundary line between the length plane and the bottom surface, with the phase shifted in the direction orthogonal to the two fold lines of the first compound fold line portion. A plurality of lower second composite fold line portions are alternately provided, and are formed at a boundary portion between the length surface and the bottom surface by bending the two fold lines of the lower first composite fold line portion. The lower first inclined corner portion and the lower second inclined corner portion formed at the boundary portion between the length surface and the bottom surface by the two fold lines of the lower second composite crease line portion are mutually formed. It is characterized in that it is provided so as to be inclined at different angles with respect to the length surface.

According to the second aspect of the present invention, when the packaging boxes are stacked, the stacking load applied to the length surface in the vertical direction is inclined at a different angle with respect to the length surface. It is offset by the 1 inclined corner portion and the lower second inclined corner portion. As a result, it is possible to suppress body swelling due to the stacking load applied to the length surface.

In the second aspect of the present invention, a single crease line extending on the boundary line between the length surface and the bottom surface is provided at both ends of the lower edge of the length surface in the length direction. Is preferable.

According to this, when the length surface is bent and erected with respect to the bottom surface in the box-making work, the lower first composite crease line portion and the lower portion are guided by a single crease line at both ends of the upper edge of the length surface. Bending with the second compound crease line portion can be smoothly performed.

A third aspect of the present invention is a plurality of upper first composite crease line portions composed of two fold lines formed parallel to both sides along a boundary line between the length surface and the top surface. Two folds formed parallel to both sides along the boundary between the length plane and the top plane, with the phase shifted in the direction orthogonal to the two fold lines of the upper first compound fold line portion. A plurality of upper second composite crease line portions composed of eye lines are alternately provided, and by bending the two fold lines of the upper first composite fold line portion, the boundary portion between the length surface and the top surface is formed. The upper second inclined corner portion formed at the boundary portion between the length surface and the top surface by the two fold lines of the upper first inclined corner portion and the upper second compound crease line portion. Is provided so as to incline from each other at different angles with respect to the length surface, and from two crease lines formed parallel to both sides along the boundary line between the length surface and the bottom surface. Along the boundary line between the length plane and the bottom surface, the phase is shifted in a direction orthogonal to the two fold lines of the plurality of lower first composite fold line portions and the lower first composite fold line portion. A plurality of lower second composite fold lines composed of two fold lines formed in parallel on both sides thereof are alternately provided, and the two fold lines of the lower first composite fold line are bent to obtain the above. The boundary portion between the long surface and the bottom surface is formed by the two fold lines of the lower first inclined corner portion formed at the boundary portion between the length surface and the bottom surface and the lower second compound crease line portion. The lower second inclined corner portion to be formed is characterized in that it is provided so as to be inclined at different angles with respect to the length surface.

According to the third aspect of the present invention, when the packaging boxes are stacked, the stacking load applied to the length surface in the vertical direction is the upper first inclined corner portion and the upper second inclined corner portion. At the same time, they are offset by the lower first inclined corner portion and the lower second inclined corner portion. As a result, it is possible to suppress body swelling due to the stacking load applied to the length surface.

At this time, the inclination angle with respect to the length surface of the upper first inclined corner portion is equal to the inclination angle with respect to the length surface of the lower first inclined corner portion, and the length surface of the upper second inclined corner portion. The inclination angle with respect to is equal to the inclination angle with respect to the length surface of the lower second inclined corner portion, and the upper first inclined corner portion is located directly above the lower second inclined corner portion and is located directly above the upper second inclined corner portion. The two inclined corners are preferably located directly above the lower first inclined corner.

According to this, the stacking load applied to the length surface in the vertical direction is offset by the upper first inclined corner portion on the upper edge side of the length surface and the lower second inclined corner portion on the lower edge side. It is also offset by the upper second inclined corner on the upper edge side of the length surface and the lower first inclined corner on the lower edge side. Therefore, it is possible to more effectively suppress the body swelling due to the stacking load applied to the length surface.

Here, "equal to the tilt angle" does not mean that the angles match without error. For example, the tilt angle of the upper first tilt corner with respect to the length surface is large (or small), and the upper second When the inclination angle of the inclined corner portion with respect to the length surface is small (or large), the inclination angle of the lower first inclined corner portion with respect to the length surface is large (or small), and the lower second inclined corner angle is large (or small). It means that the inclination angle with respect to the length surface of the part is small (or large), and the magnitude relation of the angles formed is the same.

Numerically speaking, about plus or minus 5 ° is within the range of "equal to the tilt angle".

Further, in the third aspect of the present invention, a single crease line extending on the boundary line between the length surface and the top surface is provided at both ends of the upper edge of the length surface in the length direction. It is preferable that a single crease line extending on the boundary line between the length surface and the bottom surface is provided at both ends of the lower edge of the length surface in the length direction.

As a result, when the length surface is erected with respect to the bottom surface in the box making work, the lower first compound crease line and the lower second compound fold are guided by the guidance of a single crease line at both ends of the lower edge of the length surface. As the bending progresses smoothly with the line of sight, when the top surface is bent horizontally with respect to the length surface, the upper first composite is guided by a single crease line at both ends of the upper edge of the length surface. The progress of bending between the fold line portion and the upper second composite fold line portion proceeds smoothly, and the box making work becomes easier.

The plan view of the assembled state of the packaging box of one Embodiment of this invention. The side view which shows the length surface of the assembled state of the packaging box of this embodiment. The side view which shows the width surface of the assembled state of the packaging box of this embodiment. The bottom view of the assembled state of the packaging box of this embodiment. The development view of the packaging box of this embodiment (Example 4). FIG. 6A is an explanatory view of the upper first composite fold line portion and the upper second composite fold line portion, and FIG. 6B is an explanatory view of the lower first composite fold line portion and the lower second composite fold line portion. Explanatory sectional view of the main part of the packaging box of this embodiment. Explanatory sectional view of another main part of the packaging box of this embodiment. The development view of the packaging box of another embodiment (Example 5). The development view of the packaging box of another embodiment (Example 1). The development view of the packaging box of another embodiment (Example 2). The development view of the packaging box of another embodiment (Example 3).

An embodiment of the present invention will be described with reference to the drawings. The packaging box of the present embodiment in which each surface is shown in FIGS. 1 to 4 is called a wraparound case, and is a corrugated cardboard formed into a rectangular parallelepiped by bending the blank sheet 1 shown in FIG. 5 at a predetermined position. It is a case made of.

The packaging box was connected to the rectangular top surface 2 viewed in plan view in FIG. 1, the length surface 3 shown in FIG. 2 connected to the long side of the top surface 2, and the short side of the top surface 2. It includes a width surface 4 shown in FIG. 3 and a bottom surface 5 facing the top surface 2 and closing the bottom surface.

Reference numeral 6 shown in FIG. 2 is a tear band for opening by liner cutting, and reference numeral 7 shown in FIG. 3 is a hand hole for inserting a hand when holding the packaging box.

FIG. 5 is a development view of the packaging box, which is a blank sheet 1 before box making. As shown in FIG. 5, the blank sheet 1 has a bottom plate 51 as a bottom surface 5, a top plate 21 as a top surface 2 facing the bottom surface 5, and a pair of length surfaces 3 facing each other in an upright state. A side plate 31 and an adhesive piece 22 for connecting one side plate 31 and the top plate 21 are provided. The adhesive piece 22 is adhered to the top plate 21 to form a part of the top surface 2.

Further, the blank sheet 1 includes outer flaps 41 connected to both ends of the bottom plate 51 and both ends of the top plate 21, and inner flaps 42 connected to both ends of each side plate 31. The outer flap 41 is adhered to the outer surface of the inner flap 42 to form the width surface 4.

At the boundary between the top plate 21 and the side plate 31, a plurality of upper first composite fold line portions 10 and a plurality of upper second composite fold line portions 11 are alternately formed along the upper edge of the side plate 31. .. The upper first composite fold line portion 10 is composed of two crease lines formed in parallel (upper side fold line 10a and lower side fold line 10b), and the upper second composite fold line portion 11 is formed in parallel 2 It consists of a book fold line (upper side fold line 11a and lower side fold line 11b).

As shown in FIG. 6, the upper first composite fold line portion 10 and the upper second composite fold line portion 11 are formed by shifting their phases in the directions orthogonal to the upper fold lines 10a and 11a and the lower side fold lines 10b and 11b. Has been done.

Further, the upper first composite fold line portion 10 and the upper second composite fold line portion 11 are continuous via the connecting composite fold line portion 12. That is, as shown in FIG. 6, the connection compound fold line portion 12 is composed of three fold lines, an upper side connection fold line 12a, a lower side connection fold line 12b, and an intermediate connection fold line 12c.

The upper side connecting fold line 12a connects the upper side fold line 10a of the upper first composite fold line portion 10 and the upper side fold line 11a of the upper second composite fold line portion 11. The lower side connecting fold line 12b connects the lower side fold line 10b of the upper first composite fold line portion 10 and the lower side fold line 11b of the upper second composite fold line portion 11. Further, the intermediate connection fold line 12c connects one end of the upper side connection fold line and one end of the lower side connection crease line, thereby connecting the upper first composite fold line portion 10 and the upper second composite crease line portion 11. However, it is visually recognized as if it is a plurality of hexagonal shapes connected in a band shape.

Similarly, at the boundary portion between the bottom plate 51 and the side plate 31, a plurality of lower first composite fold line portions 13 and a plurality of lower second composite fold line portions 14 are alternately formed along the lower edge of the side plate 31. Has been done. The lower first compound fold line portion 13 is composed of two crease lines formed in parallel (upper side fold line 13a and lower side fold line 13b), and the lower second composite fold line portion 14 is formed in parallel 2 It consists of a book fold line (upper side fold line 14a and lower side fold line 14b).

As shown in FIG. 6, the lower first composite fold line portion 13 and the lower second composite fold line portion 14 are formed by shifting their phases in the directions orthogonal to the upper fold lines 13a and 14a and the lower side fold lines 13b and 14b. Has been done.

Further, the lower first composite fold line portion 13 and the lower second composite fold line portion 14 are continuous via the connecting composite fold line portion 15. That is, as shown in FIG. 6, the connection compound fold line portion 15 is composed of three fold lines, an upper side connection fold line 15a, a lower side connection fold line 15b, and an intermediate connection fold line 15c.

The upper side connecting fold line 15a connects the upper side fold line 13a of the lower first composite fold line portion 13 and the upper side fold line 14a of the lower second composite fold line portion 14. The lower side connecting fold line 15b connects the lower side fold line 13b of the lower first composite fold line portion 13 and the lower side fold line 14b of the lower second composite fold line portion 14. Further, the intermediate connection fold line 15c connects one end of the upper side connection fold line and one end of the lower side connection crease line, thereby connecting the lower first composite fold line portion 13 and the lower second composite crease line portion 14. However, it is visually recognized as if it is a plurality of hexagonal shapes connected in a band shape.

When the packaging box is assembled from the blank sheet 1, as shown in FIG. 7, the upper first composite fold line portion 10 forms the upper first inclined corner portion 16, and the lower second composite fold line portion 14 forms the lower portion. The second inclined corner portion 17 is formed. Similarly, as shown in FIG. 8, the upper second composite fold line portion 11 forms the upper second inclined corner portion 18, and the lower first composite fold line portion 13 forms the lower first inclined corner portion 19. Form.

Further, as shown in FIGS. 7 and 8, the upper first inclined corner portion 16 and the lower first inclined corner portion 19 have the same inclination angle with respect to the length surface 3, and the upper second inclined corner portion 18 And the lower second inclined corner portion 17 have the same inclination angle with respect to the length surface 3.

Further, the inclination angle of the upper first inclined corner portion 16 with respect to the length surface 3 is smaller than the inclination angle of the upper second inclined corner portion 18 with respect to the length surface 3, and the lower first inclined corner angle with respect to the length surface 3 The inclination angle of the portion 19 is smaller than the inclination angle of the lower second inclined corner portion 17 with respect to the length surface 3.

Then, as shown in FIG. 7, the upper first inclined corner portion 16 is located directly above the lower second inclined corner portion 17, and as shown in FIG. 8, the upper second inclined corner portion 18 is located. It is located directly above the lower first inclined corner portion 19.

When a plurality of packaging boxes having the above configuration are stacked and a stacking load is applied to the length surface 3 in the vertical direction, the upper first inclined corner portion 16 and the upper portion are applied to the upper edge of the length surface 3. The second inclined corner portion 18 distributes the load to the outside and the inside. At this time, the length surface 3 is slightly wavy deformed by the upper first inclined corner portion 16 and the upper second inclined corner portion 18, and the strength of the length surface 3 in the vertical direction increases. To do. As a result, body swelling is suppressed.

At the same time, at the lower edge of the length surface 3, the lower first inclined corner portion 19 and the lower second inclined corner portion 17 distribute the load outward and inward. At this time, the length surface 3 is slightly wavy deformed by the lower first inclined corner portion 19 and the lower second inclined corner portion 17, but the upper first inclined corner portion 16 is the lower portion. It is located directly above the second inclined corner portion 17, and the upper second inclined corner portion 18 is located directly above the lower first inclined corner portion 19, so that the upper edge side and the lower edge side of the length surface 3 are located. Since the waviness direction is opposite, the deformation is canceled out, and the waviness deformation is not visible in appearance.

As described above, the packaging box of the present embodiment can suppress the swelling of the body and maintain a good appearance without causing a change in appearance due to an increase in the strength of the length surface 3.

In the present embodiment, the upper first composite fold line portion 10 and the upper second composite fold line portion 11 are alternately formed over the entire length of the upper edge of the length surface 3, and the lower edge of the length surface 3 is formed. Although the lower first composite crease line portion 13 and the lower second composite crease line portion 14 are alternately formed over the entire length, as another embodiment, as shown in FIG. 9, above the length surface 3. A pair of upper boundary crease lines 8 (single crease lines) extending singly at both ends in the length direction of the edge may be provided. Further, a pair of lower boundary fold lines 9 (single fold lines) extending singly may be provided at both ends of the lower edge of the length surface 3 in the length direction.

According to this, when the length surface 3 (side plate 31) is erected with respect to the bottom surface 5 (bottom plate 51) in the box making operation, the guidance of the lower boundary crease line 9 at both ends of the lower edge of the length surface 3 is used. The bending progress of the lower first composite fold line portion 13 and the lower second composite fold line portion 14 proceeds smoothly, and when the top surface 2 is bent horizontally with respect to the length surface 3, the length surface 3 By guiding the upper boundary fold lines 8 at both ends of the upper edge, the bending progress of the upper first composite fold line portion 10 and the upper second composite fold line portion 11 proceeds smoothly, and the box-making operation becomes easier.

Further, in the present embodiment, on the length surface 3, the upper first inclined corner portion 16 is arranged directly above the lower second inclined corner portion 17, and the upper second inclined corner portion 18 is arranged at the lower first inclined corner portion 17. By arranging it directly above the corner portion 19, when the length surface 3 receives a stacking load, the upper edge side and the lower edge side cancel each other out in the opposite direction of the wave, and the strength of the length surface 3 The one that does not cause the change in appearance with the increase is shown.

On the other hand, on the length surface 3, the upper first inclined corner portion 16 is arranged directly above the lower first inclined corner portion 19, and the upper second inclined corner portion 18 is arranged at the lower second inclined corner portion 17. It is also possible to place it directly above. According to this, when the length surface 3 receives a stacking load, the wave direction is the same on the upper edge side and the lower edge side, so that the wave deformation of the length surface 3 becomes relatively large, but it is sufficient. Since sufficient strength is ensured, swelling of the body can be suppressed as in the above embodiment.

Further, in the present embodiment, the first inclined corner portions 16 and 19 and the second inclined corner portions 17 and 18 are formed on both the upper edge and the lower edge of the length surface 3. In addition to this, although not shown, the first inclined corner portion and the second inclined corner portion may be formed only on either the upper edge or the lower edge of the length surface. In this case, although the strength of the length surface is slightly reduced, the effect of suppressing the body swelling can be sufficiently obtained.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples and the like.

[Example 1]
A packaging box was prepared by packaging 24 500 mL PETs (6 vertical × 4 horizontal) with the blank sheet 1 in the unfolded state shown in FIG. This packaging box has only the upper first composite fold line portion 10 and the upper second composite fold line portion 11. The upper first composite fold line portion 10 and the upper second composite fold line portion 11 are formed in a total of six, three each corresponding to the diameter of the canned beer.

A load was applied to the packaging box from the top surface 2 to the bottom surface 5 of the packaging box using a compression tester until the limit compression.

Then, the distance from the lower end edge of the length surface 3 to the portion bulging toward the outermost side at this time was measured as the maximum body bulge. Further, it was visually confirmed whether or not the length surface 3 was bent in the vertical direction due to this load and vertical wrinkles were generated. Further, it was visually confirmed whether or not buckling was generated in the outer flap 41 (hereinafter, simply referred to as "upper outer flap") on the side where the hand hole 7 was formed by this load. Furthermore, the ease of folding the crease line during the box-making work (easiness of box-making) was confirmed.

[Example 2]
A packaging box having the same configuration as that of Example 1 except that the blank sheet 1 shown in FIG. 11 was used was produced, and the maximum body swelling, the presence or absence of vertical wrinkles, the presence or absence of buckling, and the presence or absence of buckling were produced in the same manner as in Example 1. We confirmed the ease of box making. This packaging box has only the lower first composite fold line portion 13 and the lower second composite fold line portion 14.

[Example 3]
A packaging box having the same configuration as that of Example 1 except that the blank sheet 1 shown in FIG. 12 was used was produced, and the maximum body swelling, the presence or absence of vertical wrinkles, the presence or absence of buckling, and the presence or absence of buckling were produced in the same manner as in Example 1. We confirmed the ease of box making. In this packaging box, the upper first composite fold line portion 10 and the upper second composite crease line portion 11 and the lower first composite fold line portion 13 and the lower second composite crease line portion 14 are cut and lined with a tear band 6 interposed therebetween. Since it is formed symmetrically, the upper first inclined corner portion 16 is located directly above the lower first inclined corner portion 19, and the upper second inclined corner portion 18 is directly above the lower second inclined corner portion 17. Located in.

[Example 4]
A packaging box having the same configuration as that of Example 1 except that the blank sheet 1 shown in FIG. 5 was used was produced, and the maximum body swelling, the presence or absence of vertical wrinkles, the presence or absence of buckling, and the presence or absence of buckling were produced in the same manner as in Example 1. We confirmed the ease of box making. In this packaging box, as shown in FIGS. 7 and 8, the upper first inclined corner portion 16 is located directly above the lower second inclined corner portion 17, and the upper second inclined corner portion 18 is the lower first. It is located directly above the inclined corner portion 19.

[Example 5]
A packaging box having the same configuration as that of Example 1 except that the blank sheet 1 shown in FIG. 9 was used was produced, and the maximum body swelling, the presence or absence of vertical wrinkles, the presence or absence of buckling, and the presence or absence of buckling were produced in the same manner as in Example 1. We confirmed the ease of box making.

In this packaging box, two upper first composite fold line portions 10 and two lower second composite fold line portions 14 and three upper second composite fold line portions 11 and three lower first composite fold line portions 13 are formed. The upper boundary crease line 8 or the lower boundary crease line 9 is connected to both ends thereof. The positions and lengths of the upper first composite fold line portion 10, the upper second composite fold line portion 11, the lower first composite fold line portion 13 and the lower second composite fold line portion 14 are based on the diameter of the canned beer. Not supported.

Further, in this packaging box, as in the fourth embodiment, the upper first inclined corner portion 16 is located directly above the lower second inclined corner portion 17, and the upper second inclined corner portion 18 is the lower first inclined corner portion 18. It is located directly above the corner portion 19.

[Comparative Example 1]
From the blank sheet 1 shown in FIGS. 5 and 9, the upper first composite fold line portion 10, the upper second composite fold line portion 11, the lower first composite fold line portion 13 and the lower second composite fold line portion 14 were removed. Using a normal blank sheet 1, a packaging box having the same configuration as that of Example 1 is produced except for the above, and the maximum body swelling, the presence or absence of vertical wrinkles, the presence or absence of buckling, and the production are carried out in the same manner as in Example 1. The ease of packaging was confirmed.

Table 1 shows the above test results for the packaging boxes of Examples 1 to 5 and Comparative Example 1.

As is clear from the test results, it was found that the body swelling was suppressed in Examples 1 to 5 as compared with the Comparative Examples.

Further, since the maximum body swelling was suppressed in Examples 3 to 5 as compared with Examples 1 and 2, it was found that it is preferable to provide the composite crease line portion on both the upper and lower end edges of the length surface. It was.

Further, since vertical wrinkles are suppressed in Examples 4 and 5 as compared with Example 3, the upper first composite fold line portion 10, the upper second composite crease line portion 11, and the lower first composite fold line portion 11 are suppressed. It was found that it is preferable to form the 13 and the lower second composite crease line portion 14 asymmetrically with the rift zone 6 interposed therebetween.

Similarly, in Examples 4 and 5, buckling of the upper outer flap 41 is prevented as compared with Example 3, so that the upper first composite fold line portion 10 and the upper second composite fold line portion 11 and the lower portion are prevented. It was found that it is preferable that the first composite fold line portion 13 and the lower second composite crease line portion 14 are formed asymmetrically with the rift zone 6 interposed therebetween.

Further, in Example 5, as compared with Examples 1 to 4, the ease of box making, that is, the ease of bending when the top surface and the bottom surface are bent with respect to the length surface is improved, so that the length surface is improved. It was found that it is preferable that a single crease line is formed at both ends of the boundary line with the top surface or the bottom surface.

1 ... Blank sheet (blank), 2 ... Top surface, 3 ... Length surface, 4 ... Width surface, 5 ... Bottom surface, 8 ... Upper boundary crease line (single crease line), 9 ... Lower boundary crease line (single) Fold line), 10 ... Upper 1st compound fold line, 11 ... Upper 2nd compound fold, 13 ... Lower 1st compound fold, 14 ... Lower 2nd compound fold, 16 ... Upper 1st Inclined corners, 17 ... Lower second inclined corners, 18 ... Upper second inclined corners, 19 ... Lower first inclined corners.

Claims (7)

A corrugated cardboard blank on which a crease line is formed is bent according to the crease line to form a pair of length planes that stand upright from each other and a pair of width planes that face each other in a direction orthogonal to both length planes. A packaging box formed in a rectangular parallelepiped having a top surface and a bottom surface facing each other in the vertical direction.
A plurality of upper first composite crease lines composed of two crease lines formed parallel to both sides along the boundary line between the length surface and the top surface, and two of the upper first composite crease line portion. A plurality of upper second composites composed of two fold lines formed parallel to both sides along the boundary line between the length plane and the top surface, which are shifted in the direction orthogonal to the fold line of the book. Folded lines are provided alternately,
The upper first inclined corner portion formed at the boundary portion between the length surface and the top surface by bending the two fold lines of the upper first compound crease line portion, and the upper second compound fold line portion. The upper second inclined corner portion formed at the boundary portion between the length surface and the top surface by the two fold lines of the portion is provided so as to be inclined at different angles with respect to the length surface. A packaging box characterized by being made. The first aspect of the present invention, wherein a single crease line extending on a boundary line between the length surface and the top surface is provided at both ends of the upper edge of the length surface in the length direction. Packaging box. A corrugated cardboard blank on which a crease line is formed is bent according to the crease line to form a pair of length planes that stand upright from each other and a pair of width planes that face each other in a direction orthogonal to both length planes. A packaging box formed in a rectangular parallelepiped having a top surface and a bottom surface facing each other in the vertical direction.
A plurality of lower first compound crease lines composed of two crease lines formed parallel to both sides along the boundary line between the length surface and the bottom surface, and two lower first compound crease lines. A plurality of lower second compound crease lines composed of two crease lines formed parallel to both sides along the boundary line between the length plane and the bottom surface with the phase shifted in the direction orthogonal to the crease line. The parts are provided alternately,
The lower first inclined corner portion formed at the boundary portion between the length surface and the bottom surface by bending the two fold lines of the lower first composite fold line portion, and the lower second composite fold line portion. The lower second inclined corner portion formed at the boundary portion between the length surface and the bottom surface by the two crease lines is provided so as to be inclined at different angles with respect to the length surface. A packaging box characterized by being present. The third aspect of claim 3, wherein a single crease line extending on a boundary line between the length surface and the bottom surface is provided at both ends of the lower edge of the length surface in the length direction. Packaging box. A corrugated cardboard blank on which a crease line is formed is bent according to the crease line to form a pair of length planes that stand upright from each other and a pair of width planes that face each other in a direction orthogonal to both length planes. A packaging box formed in a rectangular parallelepiped having a top surface and a bottom surface facing each other in the vertical direction.
A plurality of upper first composite crease lines composed of two crease lines formed parallel to both sides along the boundary line between the length surface and the top surface, and two of the upper first composite crease line portion. A plurality of upper second composites composed of two fold lines formed parallel to both sides along the boundary line between the length plane and the top surface, which are shifted in the direction orthogonal to the fold line of the book. Folded lines are provided alternately,
The upper first inclined corner portion formed at the boundary portion between the length surface and the top surface by bending the two fold lines of the upper first compound crease line portion, and the upper second compound crease line portion. The upper second inclined corner portion formed at the boundary portion between the length surface and the top surface by the two fold lines of the portion is provided so as to be inclined at different angles with respect to the length surface. Has been
A plurality of lower first compound crease lines composed of two crease lines formed parallel to both sides along the boundary line between the length surface and the bottom surface, and two lower first compound crease lines. A plurality of lower second compound crease lines composed of two crease lines formed parallel to both sides along the boundary line between the length plane and the bottom surface with the phase shifted in the direction orthogonal to the crease line. The parts are provided alternately,
The lower first inclined corner portion formed at the boundary portion between the length surface and the bottom surface by bending the two fold lines of the lower first composite fold line portion, and the lower second composite fold line portion. The lower second inclined corner portion formed at the boundary portion between the length surface and the bottom surface by the two crease lines is provided so as to be inclined at different angles with respect to the length surface. A packaging box characterized by being present. The inclination angle with respect to the length surface of the upper first inclined corner portion is equal to the inclination angle with respect to the length surface of the lower first inclined corner portion.
The inclination angle with respect to the length surface of the upper second inclined corner portion is equal to the inclination angle with respect to the length surface of the lower second inclined corner portion.
The upper first inclined corner portion is located directly above the lower second inclined corner portion.
The packaging box according to claim 5, wherein the upper second inclined corner portion is located immediately above the lower first inclined corner portion. At both ends of the upper edge of the length surface in the length direction, a single crease line extending on the boundary line between the length surface and the top surface is provided.
Claim 5 or 6 is characterized in that a single crease line extending on a boundary line between the length surface and the bottom surface is provided at both ends of the lower edge of the length surface in the length direction. The listed packaging box.